Question
If the third proportion of 18 and 15 is “0.4m”, then
find the value of (m − 10) : (m + 30).Solution
Third proportion of two numbers ‘a’ and ‘b’ is (b²/a). So, 0.4m = (15²/18) = 12.5. Or, 'm' = 31.25. Required value = (31.25 - 10) : (31.25 + 30) = 21.25 : 61.25 = 17 : 49
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